Google Fast Pair is a convenient feature that allows for simple and fast pairing on compatible* Android devices. After bringing the Blue BYRD (2nd gen.) or Blue BYRD ANC (2nd gen.) earphones to pairing mode, your playback device will recognize it and show it on a pop-up screen. Then simply confirm it and the pairing is done. This saves you from going through Bluetooth menu settings.
* from Android 6 with Google software